| 摘要 |
PURPOSE: An optical telescope is provided to increase an eyespot distance by arranging a lens with negative refractive power near an image formation surface of an object lens with an increased eyespot distance. CONSTITUTION: An optical telescope includes an ocular lens(110), an object lens(120), a reticle(130), and a field lens(140). The field lens is arranged on the front side or the rear side of the reticle which is arranged on an object lens image formation surface in order to increase an eyespot distance. The field lens has a negative refractive power. The surface of the field lens facing the ocular lens has a flat shape. The reticle is formed on one side of a flat lens which is arranged parallel to the flat surface of the field lens. |
